Correlation coefficients between October rainfall DBT, WBT and Rainfall of June, July, August and September

Iiidcpcndcnt variables

VP 3.1.4 VP 3.1.4 Distribution of average rainfall of the months of October and November

3.3 Correlation coefficients between October rainfall DBT, WBT and Rainfall of June, July, August and September

3.3.1 Distribution of CC between October rainfall and DBT of June, July, August and September

June: The distribution of CC between average DBT of June and the rainfall of October is shown in Fig 3.3.1 (a). The figure shows that the minimum value of CC is at Tangail and its value is -0.45. The negative CC is also observed at Satkhira and from Corn illa towards Khepupara regions. The maximum positive CC is observed at Ishwardy region and its value is 0.25.

July: The distribution of CC between average DBT of July and the rainfall of October is shown in Fig 3.3.1 (b). From the distribution pattern we observe that the CC is positive all over country with few exceptions. The CC between the average DBT of July and rainfall of October is the maximum at Chandpur and its value is 0.30 and is significant at 95% level. The minimum of that is about —0.15 and is observed at Patuakhali.

August: The distribution of CC between average DBT of August and the rainfall of October is shown in Fig 3.3.1 (c). From the distribution pattern we observe that the CC is negative in the northeast, southwest and extreme south side of the country and the CC is positive in the northwest and southeast side of the country. The maximum positive and negative value of the CC is observed at Dinajpur and Patuakhali regions and the values are 0.30 and -0.25 respectively. The CC at Dinajpur is significant at 95% level.

September: The distribution of CC between average DBT of September and the rainfall of October all over Bangladesh is shown in Fig 3.3.1 (d). The figure reveals that except southeastern, northern, northeastern part of the country and over lshwardy and Chandpur region the CC is negative. The maximum positive CC of about 0.3 over Chandpur region and highest negative CC of about —0.2 over Tangaii-Faridpur and Khulna-Patuakhali is observed.

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Fig 3.3.1(a-d): Correlation coefficients between October rainfall and DBT of

June, July, August and September respectively

3.3.2 Distribution of CC between November rainfall and average DBT of June, July, August and September

June: The distribution of CC between the average DBT of June and the rainfall of November is shown in Fig 3.3.2 (a). The distribution pattern shows that over Rajshahi, lshwardy, Jessore and Sylhet region the CC is negative. The maximum negative CC is observed at Rajshahi and Syihet and its value is -0.2. The CC is positive in the maximum region of the country. The maximum positive CC is observed at Sitakundu and its value is about 0.4. From the analysis we can say that with the increase in the average DBT oiJunc the rainfall of November will increase in Sitakundu region and that will decrease in Rajshahi and Sylhet regions.

July: The distribution of CC between average DBT of July and rainfall of November all over Bangladesh is shown in Fig 3.3.2 (b). From the distribution pattern we

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observe that the CC is negative in eastern side of the country except Sitakundu where the CC is positive and its value is about 0.15. On the other hand in the western side of the country the CC is positive except Jessore where it is negative and the value is about —0. I.

The CC between the average DBT of July and the rainfall of November is the maximum over Rajshahi-lshwardy region and its value is more than 0.15. The maximum negative CC is observed at Sylhet region and its value is less then -0.25. From the analysis we observe that if the average DBT of July increases then the rainfall of November will decrease in the eastern side and that will increase in the western side of the country and vise versa.

August: The distribution of CC between average DBT of August and rainfall of November all over Bangladesh is shown in Fig 3.3.2 (c). From the distribution pattern we observe that the CC is negative in the northern side of the country and the CC is positive in the southern side of the country except Bhola. The maximum positive CC is observed at Tcknaf region and its values is 0.45. The highest negative CC is observed over Mymensiiig region and its value is —0. I. From the analysis we can say that the average DBT of August highly positive correlation with the rainfall of November in the extreme southern and southeastern side of the country.

September: The distribution of CC between average DBT of September and rainfall of November all over Bangladesh is shown in Fig 3.3.2 (d). From the distribution pattern we observed that the CC is negative in the northeast, west central and south

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Fig 3.3.2(a-d): Correlation coefficients between November rainfall and DBT

central side of the country and the CC is positive in the northwest, southeast and central region of the country. The maximum positive value ol' the CC is observed at Tangail and Madaripur and its value is 0.45. The maximum negative value of the CC is observed at lshwardy and Khepupara region and its value is -0. 15. From the analyses we may conclude that the average DBT of September and rainfall of November is positively correlated in most of the regions. The CC is significant 95% level at Tangail and Madaripur region.

From the above observations it is clear that the CC is negative in the northern side and positive in the southern side of the country except Bhola in August and negative in south and northeast side including lshwardy and positive in central and southeastern region in September. The CC is positive in the south and southeastern side in June and negative in eastern side of the country except Sitakundu in July.

3.3.3 Distribution of CC between DBT of June, July, August and September and Post-monsoon rainfall

June: The distribution of CC between average DBT of June and average rainfall of Post-monsoon season all over Bangladesh is shown in Fig 3.3.3 (a). From the distribution pattern we observe that the CC is positive all over the country except Rajshahi, Tangail and Bhola region. The higher positive value of the CC are observed at lshwardy, llatiya and Sitakundu and are 0.30, 0.30 and 0.25 respectively. The maximum negative value of CC is observed at Tangail its value is -0.50. The CC is significant about 95% level at Tangail, lshwardy and Hatiya.

July: The distribution of CC between average DBT of July and average rainfall of Post-monsoon all over Bangladesh is shown in Fig 3.3.3 (b). From the distribution pattern we observe that over the maximum region of the country the CC is positive except southern and southeastern side of the country where the CC is negative. The maximum negative and positive value of the CC is observed at Patuakhali and Sitakundu region and the values are -0.20 and 0.25 respectively.

August: The distribution of CC between average DBT of August and rainfall of Post-monsoon all over Bangladesh is shown in Fig 3.3.3 (c). From figure it is observed that except Bhola, Satkhira, Rajshahi and northeastern side of the country, where the CC is negative, the CC is positive. The maximum negative value of CC is observed at Sylhet and is -0.20. The maximum positive value of CC is observed at Dinajpur, l-latiya and

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and September and Post-monsoon rainfall respectively

Sandwip region and is 0.3. From the analysis we can say that the average DBT of August and Post-monsoon rainfall is positively correlated i.e. any increase in the DBT of August will result some increase in the rainfall of Post-monsoon season. At Dinajpur, Sandwip and Hatiya the CC is significant at 95% level.

September: The distribution of CC between average DBT of September and average rainfall of Post-monsoon all over Bangladesh is shown in Fig 3.3.3 (d). The figure shows that the CC is negative in the southwestern and southern side of the country. The maximum positive and negative values of the CC arc observed at Chandpur and Patuakhali region and are 0.35 and -0.25 respectively.

3.3.4 Distribution of CC between WBT of June, July, August and September and rainfall of October

June: The distribution of CC between average WBT of June and average rainfall of October all over Bangladesh is shown in Fig 3.3.4 (a). From the distribution pattern we observe that the CC is negative in Tangail, Feni and Khepupara region. The maximum positive and negative value of the CC is observed at l)inajpur and Tangail region and they are 0.25 and -0.4 respectively. From the analysis we can say that the average WBT of June and average rainfall of October are positively correlated, i.e. with the increase in the average WBT of June the average rainfall of October will increase.

July: The distribution of CC between average WBT of July and average rainfall of October all over Bangladesh is shown in Fig 3.3.4 (b). The figure shows that the CC is negative in the northeast, southeastern region and Tangail region of the country. The CC is positive in the northwest and central region of the country. The maximum positive value of the CC is observed at Chandpur region and its values is 0.30 and the maximum negative value of CC is observed at Tangail and Srimongal region and its value is -0.15

August: The distribution of CC between average WBT of August and average rainfall of October all over Bangladesh is shown in Fig 3.3.4 (c). The distribution pattern shows that the CC is positive in the northwest, northeast and southeastern side of the country. It is also observed that CC is negative in the most of the regions of the country.

The maximum positive and negative values of CC arc observed at Dinajpur and Tangail region and are 0.35 and -0.40 respectively.

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88 89 90 Longtude 91 92

3 89 90 LaigiUde 91 92

88 89 90 .ongiI4e 91 92 88 89 90 Lalgitude 91 92

Fig 3.3.4(a-d): Correlation coefficients between WBT of June, July, August

September: The distribution of CC between average WBT of September and average rainfall of October all over Bangladesh is shown in Fig 3.3.4 (ci). From the distribution pattern we observe that the CC is negative over 13ogra, Tangail, Mymcnsing, Sylhet, Khulna and southeastern side of the country. The maximum positive value of CC is observed at Patuakhali, Chandpur and Hatiya and the maximum negative value of CC is observed at Bogra and Rangarnati region and the values are 0.20 and -0.20 respectively.

3.3.5 Distribution of CC between WBT of June, July, August and September and rainfall of November

June: The distribution of CC between average WBT of June and average rainfall of November all over Bangladesh is shown in Fig 3.3.5 (a). From the distribution pattern we observe that the CC is positive all over the countly except Bhola. The maximum positive value 0.55 of the CC is observed at Sitakundu. The negative value of the CC is observed at Bhola and is -0.15. From the analysis we may conclude that the \VBT oiJune and rainfall of November are positively correlated i.e. with the increase the WBT of June the rainiall of November will also increase.

July: The distribution of CC between the average WBT of July and average rainfall of November all over Bangladesh is shown in Fig 3.3.5 (b). From the distribution pattern we observe that the CC is negative in the northeast, southeast and southern region of the country. The maximum positive and negative values of the CC are observed at Rajsliahi, Madaripur and Teknaf and are 0.30, 0.25 and ^-0.20 respectively.

August: The distribution of CC between the average WBT of August and the average rainfall of November all over Bangladesh is shown in Fig 3.3.5 (c). From the distribution pattern we observe that the CC is negative in the northeastern side of the country and in other region the CC is positive. The maximum positive and negative

11

values of CC are observed at Sitakundu and Sylhet region and are 0.50 and —0.20 respectively. From the analysis we can say that the WBT of August and the rainfall of November are the positively correlated over maximum regions of the country.

September: The distribution of CC between the average WI3T of September and the average rainfall of November all over the countiy is shown in Fig 3.3.5 (d). From the distribution pattern it is observed that the CC is positive all over the country. 'l'he higher positive values of CC are observed at Madaripur and Tangail region and are 0.50 and 0.40 respectively. From the analysis we can say that the rainfall of November will increase if the average Win' of September increases.

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Fig 3.3.5(a-d): Correlation coefficients between WBT of June, July, August

3.3.6 Distribution of CC between WBT of June,

July,

August and September and Post-monsoon rainfall

June: The distribution of CC between the average WBT of June and the average rainfall of Post-monsoon all over Bangladesh is shown in Fig 3.3.6 (a). From the distribution pattern we observe that the CC is positive all over the country except Tangail.

The maximum negative and the positive values of the CC are observed at Tangail and Dinajpur and are -0.35 and 0.25 respectively. From the analysis we can say that the rainfall of Post-monsoon season will increase if the WBT of June decreases over Tangail and increases all other regions.

July: The distribution of CC between the average WBT of July and the average rainfall of Post-monsoon season all over Bangladesh is shown in Fig 3.3.6 (b). From the distribution pattern we observe that the CC is negative in the northeast, southeast and southern region of the country. The positive value of CC is observed in the central and northwestern region of the country. The maximum positive and negative values of the CC are observed at Chandpur and Srimongal region and are 0.25 and 0.20 respectively.

August: The distribution CC between the average WBT of August and the average rainfall of Post-monsoon season all over Bangladesh is shown in Fig 3.3.6 (c).

From the distribution pattern we observe that the CC is positive all over the country except Srimongal, Sitakundu, Tangail and Sundarbon region. The maximum positive and negative values of the CC are observed at Dinajpur and Tangail region and are 0.40 and ^- 0.35 respectively. From the analysis we can say that the average raitititil of Post-monsoon season will increase in the northwestern side of the country with the increases of WBT in August.

September: The distribution of CC between the average WBT of September and the average rainfall of Post-monsoon season all over the country is shown in Fig 3.3.6 (d).

From the distribution pattern it is observed the CC is positive in the western and eastern side of the country. The maximum positive value of the CC is observed at Madaripur and Sandwip region and is 0.30.

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Fig 3.3.6(a-d): Correlation coefficients between WBT of June, July, August

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3.3.7 Distribution of CC between Rainfall of June, July, August

^and

September and October Rainfall

June: The distribution of CC between the average Rainfall of June and the average rainfall of October all over Bangladesh is shown in Fig 3.3.7 (a). From the distribution pattern we observe that the CC is negative in the Srimongal, Bogra, Maizdy, Sitakundu and southwest region of the country. The CC is positive in the northwest, west and southern region of the country. The higher positive values of the CC are observed at

lshwardi and Hatiya and are 0.25 and 0.2 respectively.

July: The distribution of CC between the average rainfall of July and the average rainfall of October all over Bangladesh is shown in Fig 3.3.7 (b). The distribution shows that the CC is negative all over country except lshwardy, Khulria, Hatiya, Madaripur, Patuakhali, Rangamati. Barisal and Cox's Bazar region. The maximum negative and positive values of the CC are observed at Bogra and Khulna and are -0.20 and 0.3 respectively. From the analysis we can say that the rainfall of July and the rainfall of October are the negatively correlated over maximum regions of the country i.e. for any increase in the rainfall of July the rainfall of October will be decreased.

August: The distribution of CC between the average rainfall of August and the average rainfall of October all over Bangladesh is shown in Fig 3.3.7 (c). From the distribution pattern we observe that the CC is positive over Jessore, Faridpur, Madaripur, Bogra, Rajshahi, Myrnensing and Coniilla region. The maximum positive CC is observed at Madaripur region and is 0.15. The maximum negative CC is observed at l'angail and is -0.35. From the analysis we can say that the average rainfall of August and the average rainfall of October are the negatively correlated in the maximum region of the country i.e.

for the increase the rainfall of August the rainfall of October will be decreased.

September: The distribution of CC between the average rainfall of September and the average rainfall of October all over Bangladesh is shown in Fig 3.3.7 (d). From the distribution pattern we observe that the CC is positive all over country except lshwardy and Sitakundu region where it is negative. The CC is highest at Tangail and next higher value is observed at Madaripur and Comilla region and are 0.45 and 0.35 respectively.

From the analysis we can say that for any increase in the rainfall of September the rainfall of October will be increased.

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3.3.8 Distribution of CC between

Rainfall

of June,

July,

August and September and

November Rainfall

June: The distribution of CC between the average rainfall of June and the average rainfall of November all over Bangladesh is shown in Fig 3.3.8 (a). From the distribution pattern we have observed that the CC is positive all over the country except southern and eastern side of the country where the CC is negative. The maximum negative CC is observed at Sitakundu and is -0.20. The maximum positive CC is observed at Bogra and Tangail region and are 0.35 and 0.30 respectively.

July: The distribution of CC between the average rainfall of July and the average rainfall of November all over Bangladesh are shown in Fig 3.3.8 (b). The distribution pattern shows that the CC is positive all over country except Sylhet, Faridpur, Satkhira, Bhola and Maizdy-court region where the CC is negative. The maximum positive CC is A observed at Bogra, Tangail and Mymensing region and its value is 0.20.

August: The distribution of CC between the average rainfall of August and the average rainfall of November all over Bangladesh is shown in Fig 3.3.8 (c). From the distribution pattern we observe that the CC is positive in the northern and eastern side and negative in the southern and southeastern side of the country. The maximum negative CC is observed at Patuakhali, Khepupara and Madaripur region where the value is -0.25. The maximum positive CC is observed at Sylhet region where the value is 0.40. The CC is significant at 99% level at Sylhet.

September: The distribution of CC between the average rainfall of September and the average rainfall of November all over Bangladesh is shown in Fig 3.3.8 (d). From the distribution pattern we observe that the CC is positive in the northern, southern and western region and negative in the central and eastern region of the country. The maximum negative value of CC is observed at Tangail and is -0.35. The maximum positive value of CC is observed at Dinajpur and Rangpur region and is 0.35 and at Sundarbon. Khepupara region the value of CC is 0.25. The

CC

is significant at 99% level at Rangpur and Dinajpur regions.

Dalam dokumen Multiple Correlation Between Rainfall of Post-Monsoon Season and the Different Meteorological Parameters of the Monsoon Season Over Bangladesh (Halaman 55-71)